I have a serious problem alert

Some thoughts from a returning grower learning some of these lessons as well.

- 86f is hot, but you say you are running LEDs, from my understandng, plants under LEDs can thrive in increased ambient temps due to the lowered UV output of LED lights. In other words, your leaf temps under LEDs at mid 80's are around the same as leaf temps under HIDs in mid 70's.

- Are you dimming the lights at all? (are they the easily dimmable model), if you really can't deal with the heat in any other way, and it isn't going to work, you may need to dim just enough to take the edge off, but read up on LEDs and increased ambient temps first. you might not need to.

- I'm not sure I understand the sealed room with a vent out the window. If you are sucking air out, new air has to come in from somewhere. If you've sealed room, air is either finding a way in through every crack it can, or if you did a perfect job, your fan is creating a vacuum until it can no longer overcome the force and is unable to remove anymore air. You would normally have a vented room with fresh air intake(s), or a sealed room where no air leaves or enters the room and instead you use AC, dehumidifiers, humidifers and CO2 to control the environment.

A quick fix might be:

- Read up on LED ambient temps and maybe try doing nothing at all 86f might just pass.
- Dim the lights a bit and see how much you need to dim to get it acceptable.
- Find a place to cut a passive intake at least twice as big as your exhaust so that your fan doesn't need to fight to change the air in your room. Air goes out, air has to come in, and to make it easy on the fan, it should have a larger intake than exhaust.

Omg perfect, ok so I have this ac infinity 8 in, with carbon filter, ur telling me that that also provides fresh air also for me?

I have that same size room! The heat build up made the exhaust fan run almost constantly and that was sucking out all my humidity.
Maybe get a second fan and bring in air from outside your room? Turn it on low so you still maintain a negative pressure or you’ll have a nice smell all over the house lol
That’s what I did and the exhaust fan ran less and the room is now 70 to 72 degrees all the time.
Btw if your neighbours are nosy make sure you have good carbon filters.

Second fan? Like another infinity 8 in ? Show me ur set up, ima take pics now with lights I have them all at 50% running

SkyFox said:

Second fan? Like another infinity 8 in ? Show me ur set up, ima take pics now with lights I have them all at 50% running

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I have two 8” vortex S line fans
Intake is on a Grozone HT2 controller. Brings in cool air from outside the room when needed.
Exhaust is on low and constantly exhausting to keep heat down and smell is almost non existent because of a full time negative pressure.

my basement is cool so it’s like pumping In AC.

I’d try that before getting an AC unit. Cheaper and you don’t have to worry about exhausting AC hot air.

So I should but another inline fan that pushes air from outside in, hmm even thos the air out is hot? Temperature outside gets up to be like 105°f

SkyFox said:

So I should but another inline fan that pushes air from outside in, hmm even thos the air out is hot? Temperature outside gets up to be like 105°f

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No bring it in from an adjacent room inside
Do not bring in outside air. You could bring in spores that are bad and like you said it’s just hot air.
My room is in the basement and I bring in air from the empty basement into the room (tent)

SkyFox said:

So I should but another inline fan that pushes air from outside in, hmm even thos the air out is hot? Temperature outside gets up to be like 105°f

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No, don't pull air from outside. He meant outside of room/tent.

SkyFox said:

Omg perfect, ok so I have this ac infinity 8 in, with carbon filter, ur telling me that that also provides fresh air also for me?

Click to expand...

SkyFox said:

So I should but another inline fan that pushes air from outside in, hmm even thos the air out is hot? Temperature outside gets up to be like 105°f

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No to both.

You need to have a hole somewhere in your room that is allowing air in from an adjacent room inside your house that is already air conditioned and dehumidified. For example, I have a room in my basement, it has a T6 exhausting the hot carbon filtered air out of the room. On the opposite side, I have a 8x8 square hole near the floor that let's the cool air from my basement in.

What goes out must come in, and should already be air conditioned, etc.

Note: I don't see this discussed alot, but if you are pushing air out of your house, and have any gas appliances or a gas furnace, be careful. Negative pressure can cause big time problems with gas appliances.

No I mean the stove that's it, but hmm I seen some vid about this that the guy made a square hole at the bottom of his door n put little filter n vent on it,
I mean like a 8x5 with filter n vent that faces down so no light comes in , does that sound good?

N what about my central ac vent? Is that a fresh air source ?

See how at the roof I have my T6 exhausting (with a carbon filter now), and see in the other picture, those 2 black squares on the wall? Those are light-proof darkroom vent covers. They cover 2 8"x8" holes in the wall to a back hallway inside my basement. They allow cold air from my basement to be pulled in, and exhausted out.

I also don't exhaust outside my house, I exhaust into my cold air return on my furnace and allow the warm air to be recirculated through my central air conditioning and then back into the room.

Maybe that helps to visualize?

Relic79 said:

No to both.

You need to have a hole somewhere in your room that is allowing air in from an adjacent room inside your house that is already air conditioned and dehumidified. For example, I have a room in my basement, it has a T6 exhausting the hot carbon filtered air out of the room. On the opposite side, I have a 8x8 square hole near the floor that let's the cool air from my basement in.

What goes out must come in, and should already be air conditioned, etc.

Note: I don't see this discussed alot, but if you are pushing air out of your house, and have any gas appliances or a gas furnace, be careful. Negative pressure can cause big time problems with gas appliances.

Click to expand...

That’s pretty much what I meant only I use a fan to bring it in...

Would this work if I do this in my grow room door?

SkyFox said:

N what about my central ac vent? Is that a fresh air source ?

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Well that would do. When you said you sealed the room, I thought you meant you really sealed the room.

Is the AC vent open and exposed now? If you covered it, I would definitely uncover it.

Can you feel a good amount of air getting sucked in? If not, you could try something like removing the vent cover and finding one of these the right size for your vent (duct boot): https://www.homedepot.ca/product/imperial-3-1-4x10x5-inch-universal-boot-straight/1000107436 . You could try wedge it into your vent, then use the round side to connect another inline fan.

Connect the fan, and use it to actually SUCK the air into the room through the A/C vent. I've never tried it, this could inbalance your A/C and the rest of your house might not cool properley but the negative pressure you create by venting outside your house is already going to draw outside air in through the cracks around your doors and windows. I did this for a bit, and any time it was raining outside my humidity in the house was insane.

SkyFox said:

Would this work if I do this in my grow room door?

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Adding more vents will only help if your fan is exhausting more air then your vents allow in. If your vent is already allowing enough air flow for your exhaust more holes won't do much. You also have to account for light leaks (which you mentioned, but it's more work).

One way to tell. If you leave the door open, does the room cool down, then when you close the door, does the temp raise back up? If so, this is a clue that you could use larger or more intakes, or a forced air intake as @BurntByFire has mentioned. If opening and closing the door doesn't do much, you are already likely moving as much air as that fan will allow.

You could also try not venting outside, and instead venting into your cold air return or near a cold air return. When you vent outside you are going to be pulling outside warm/humid air in that your A/C needs to deal with in addition to trying to cool your room down. If you vent back inside somewhere, your A/C won't be fighting the outdoor air. Now carbon filters become very important. This is what I did, and it allowed more air to flow through my room, and for the average temp in my house to stay lower.

No that's not my door, also my central air ac vent is on open, I was asking if I do that to my door, that would be my fresh air?

Ok boss, perfect yes I checked n yes when I open door it gets fresher in my grow room

Great, these could help:

- Try not venting outside for a while and see what happens. Let the warm air stay in the house and see if your A/C can handle it. Try a shorter exhaust run with less bends, make sure the flex tube is pulled tight to lessen the ridges in the tube, smooth surfaces allow more air to move easier. This may allow your fan to work harder and pull more air through. The A/C may be able to cool it without having to fight outside air.

- Experiment with dimming, see how much you have to dim to get the temps right, you may still be happy with the output even slightly dimmed, and then you don't need to do anything.

- If you don't want to cut more holes, experiment with a second inline fan to suck air in from the A/C floor vent.

- Try a combination. If you vent inside, with a shorter ducting run, and dim slightly, it could be enough!

Well I have the inline short as possible